28121933737 has 16 divisors (see below), whose sum is σ = 30176087040. Its totient is φ = 26157382272.

The previous prime is 28121933717. The next prime is 28121933759. The reversal of 28121933737 is 73733912182.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28121933737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28121933717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63433 + ... + 245494.

It is an arithmetic number, because the mean of its divisors is an integer number (1886005440).

Almost surely, 2^28121933737 is an apocalyptic number.

It is an amenable number.

28121933737 is a deficient number, since it is larger than the sum of its proper divisors (2054153303).

28121933737 is a wasteful number, since it uses less digits than its factorization.

28121933737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309072.

The product of its digits is 381024, while the sum is 46.

The spelling of 28121933737 in words is "twenty-eight billion, one hundred twenty-one million, nine hundred thirty-three thousand, seven hundred thirty-seven".